[多选题]电机绝缘材料可分为六个等级,可以用以下哪些字母表示( ) (A) A (B) B (C) C (D) D
[单选题]比较优势理论的提出者是( )A.斯密 B.李嘉图 C.奥林 D.赫克歇尔
[单选题]在党的七大上,被确立为党的指导思想的是 ( ) A、 毛泽东思想 B、 邓小平理论 C、 “三个代表”重要思想 D、 科学发展观
[填空题]双代号网络中只有内向箭线无外向箭线段的结点是( ).
[单选题]打开和关闭数据库的命令是( ) A. C.LL/RE.ALLB. OPEN/CLOSEC. D./ENDDOD. USE
[判断题]市场营销是产品生产者与消费者之间进行商品交
[判断题]短路计算采用近似计算法,计算中各元件额定电压都为平均额定电压
[填空题]节流阀的节流口应尽量做成( )式.
[单选题]_______ is the population of ParisA. How many B. How much C. How D. What
[单选题]青霉素钠中青霉素聚合物的测定,《中国药典》采用( )A.正相HPLC法B、离子交换色谱C、反相HPLC法D、分子排阻色谱法E、离子对色谱法正确答案:D
[判断题]0110101B 的偶校验码为01101010B.( )
[单选题]要约一经发生,对( )即产生约束力.A、要约人 B、受要约人 C、第三者 D、当事人
[多选题]地聚合物水泥基材料的矿物组成 A.高活性偏高岭土B.性激活剂C.催硬剂D.外加剂
[填空题]药物化字的研究对象是
[单选题]在道路、场地条件不能满足机械行驶、作业的情况下,吊装构件时宜选 用( ).A.履带式起重机B.桅杆式起重机C.轮胎式起重机D.汽车式起重机
[判断题]煤的发热量有高位发热量和低位发热量之分.
[填空题]Gibbs-Duhem方程有多种形式,它的第一个主要用途是检验实验测得混合热力学数据的( )
[多选题]下列关于谐振电路的说法,错误的是( ).A、谐振电路的品质因数越高,电路选择性越好,因此实用中Q值越大越好B、串联谐振在L和C两端会出现过电流现象C、理想并联谐振电路对总电流产生的阻碍作用无穷大,因此总电流为零E、谐振状态下电源供给电路的功率全部消耗在电阻上
[单选题]计算机会计核算系统主要包括( ).A.账务处理系统 B.报表系统C.工资核算系统 D.以上全部
[单选题]Most A.ericans don’t like to get advice from members of their family. When they need advice, they don’t usually ask people they know. Instead many Americans write letters to newspapers and magazines which give advice on many different subjects, including family problems, sex, the use of language, health, cooking, child care, clothes, and how to buy a house or a car.Most newspapers regularly print letters from readers with problems. Along with the letters there are answers written by people who are supposed to know how to solve such problems. Some of these writers are doctors; others are lawyers or educators. B.t two of the most famous writers of advice are women without special training for these kinds of work. One of them answers letters addressed to “D.ar Abby”. The other is addressed as “Dear Ann Landers”. E.perience is their preparation for giving advice.There is one writer who hasn’t lived long enough to have much experience. She is a girl named Angel C.valiere, who started writing advice for newspaper readers at the age of ten. Her advice to young readers now appears regularly in the Philadelphia Bulletin in a column called DEAR ANGEL.Choose the right answer:According to the passage, two of the most famous writers of advice are ______________.得分/总分 A. male writers B. Dear Ann Landers and Dear Angel C. Dear Abby or Dear Angel D. female writers
[单选题]在一般情况下,气-固相催化反应的控制步骤是( ),整个过程受化学动力学控制.A. 反应物分子从气流中通过层流边界层向催化剂外表面扩散.B. 反应物分子从催化剂外表面通过微孔向催化剂内部扩散.C. 反应物分子被催化剂表面化学吸附.D. 反应物分子在催化剂表面上发生化学反应.