[填空题]在实验中或工业生产中,常把零压差下的流量(即负载为零时泵的流量)视为( )；有些液压泵在工作时,每一瞬间的流量各不相同,但在每转中按同一规律重复变化,这就是泵的流量脉动.瞬时流量一般指的是瞬时( ).
[多选题]下列属于直流锅炉启动特点的是( ).A、启动阶段应进行清洗B、不需要专门的启动旁路系统C、启动期间需维持足够的启动流量和启动压力D、启动过程中会发生短暂的膨胀现象
[单选题]以下哪种价格歧视在经济生活中最难做到 A.一级价格歧视 B.二级价格歧视 C..非线形定价 D.三级价格歧视
[判断题]短路计算时间超过4s时的短路电流周期分量有效值就是4s时短路电流周期分量有效值.
[多选题]公司理财的内容包括( ). A、投资决策 B、筹资决策 C、经营决策 D、利润分配
[多选题]下列是工程量清单计价法的特点的是( )A自主性与市场性 B法定性与强制性C分项计价单价的综合性 D合理低价中标特性
[单选题]盈亏平衡分析中,假设生产量______销售量..( ) A.大于 B.等于 C.小于 D.不确定
[单选题]按照组织形态不同,可以将基金分为( ).A. 契约型基金和公司型基金B. 开放式基金和封闭式基金C. 股票基金和债券基金D. 期权基金和期货基金
[判断题]设置沉降缝时,建筑物基础可以不用断开
[单选题]强夯法中,夯点的夯击次数,应按现场试夯的次数和夯沉量关系曲线确定,且最后两击 的平均夯沉量不大于多少__ A.50mm B.80mm C.150mmD.200mm
[单选题]含有高内皮微静脉的淋巴器官是( ). A、 A: 胸腺和骨髓 B、 B: 胸腺和脾 C、 C: 脾和淋巴结 D、 D: 淋巴结和胸腺 E、 E: 脾和扁桃体
[多选题]0SPF的hello报文的功能是( ). A、邻居发现B、发布Router ID、Router Priority等参数信息C、维持邻居关系D、同步路由器的LSDB
[问答题]即期付款信用证的国内审单付款开立、对外付款时如何帐务处理
[单选题]催化剂这一概念历史上最早是由哪位科学家于何年正式提出的( )A.奥斯特瓦尔德,1806B.贝采里乌斯,1836 C.贝采里乌斯,1806D.奥斯特瓦尔德,1836
[多选题]下列属于橡胶改性沥青的有 A.SB.B.氯丁橡胶C.丁基橡胶D.聚乙烯
[判断题]马斯洛认为,高级需要(如自我实现需要)越是得到满足,人们就越具有从事这种工作的热情.
[单选题]对供电距离较远、容量较大的电缆线路,应校验其电压损失,一般应满足( )A. B. C. D.
[填空题]饱和粘土的总应力等于孔隙水压力与( )之和.
[单选题]----___is your girl friend like? ----She is very kind and good-lookingA. How B. What C. Which D. Who
[问答题]The greatest recent changes have been in the lives of women. During the twentieth century there was an unusual shortening of the time of a woman.s life spent in caring for children. A woman who got married at the end of the 19th century would probably have been in her middle twenties, and would be likely to have seven or eight children, of whom four or five lived till they were five years old. By the time the youngest was fifteen, the mother would have been in her early fifties and would expect to live a further twenty years, during which custom, chance and health madeit unusual for her to get paid work. Today women get married at a younger age and have fewer children. Usually a woman.s youngest child will be fifteen when she is forty-five and is likely to take paid work until retirement at si脚.Even while she has the care of children,her work is lightened by household appliances (家用电器)and convenience foods.This important change in women.s way of life has only recently begun to have its full effect on women.s economic position. Even a few years ago most girls left school at the first opportunity and most of them took a full-time job. However, when they got married, they usually left work at once and never returned to it. Today the school-leaving age is sixteen, many girls stay at school after that age, and thoughwomen tend to get married young, more married women stay at work at least until shortly before their first child is born. Many more return afterwards to a full-time or part-time job. Such changes have led to a new relationship in marriage, with both husband and wife accepting a greater share of the duties and satisfaction of family life, and with both husband and wife sharing more equally in providing the money and running the home, according to the abilities and interest of each of them.
[填空题]( )能提高混凝土的早期强度,一般对混凝土的凝结时间有明显的影响