采用YY/△接法的三相变极双速异步电动机变极调速时，调速前后电动机的（）基本不变。A 发布时间：2017-07-02 17:28 │ 来源：www.tikuol.com 题型：单项选择题 问题： 采用YY/△接法的三相变极双速异步电动机变极调速时，调速前后电动机的（）基本不变。A、输出转矩 B、输出转速 C、输出功率 D、磁极对数
题型：单项选择题 完形填空。 It is Saturday morning. Sue 1 breakfast. Sue's mother and father are with her. On Saturdaymorning Sue 2 go to school. She helps her mother and father 3 home. This morning, she says to her mother, " 4 I help you, Mummy?" "Yes, you can, Sue." her mother says, "You can go to Mr. Hunter's 5 . Our clock is 6 his shop." "Mr. Hunter mends clock." Sue's father says. "Is he 7 our clock?" Sue asks. "Yes." her father says, "And this morning it's ready." "Yes, it's ready. "her mother says, " 8 Mr. Hunter's shop, Sue. Take this bag. You can put the clockin it." Sue take this bag. "Here is eighty pence, Sue." her father says, "Give it to 9 , please." "Yes, Daddy." Sue says. She puts the pence in the bag. " 10 , Mummy and Daddy." She says. Sue is happy. She is helping her mother and father.( )1.A. is having ( )2.A. isn't ( )3.A. in ( )4.A. do ( )5.A. home ( )6.A. in ( )7.A. mend ( )8.A. Go ( )9.A. Mrs. Hunter ( )10.A. Good morning B. is hasing B. doesn't B. on B. Do B. shop B. on B. mends B. Go to B. Mr.Hunter B. Good evening C. has C. don't C. at C. can C. school C. to C. mending C. go C. Miss Hunter C. Good-bye D. having D. aren't D. to D. Can D. team D. at D. to mend D. go to D. the Hunters D. Good afternoon 查看答案
题型：单项选择题 下列关于实验室测试评价论述错误的是（）A.包括整体动物实验和体外测试系统B.常用于测试化学物毒性，预示对人的危害C.评价有害因素潜在作用D.结合临床观察结果，阐明接触水平-反应关系E.制订人体参考界限值 查看答案
题型：单项选择题 关于正确行使自由裁量权，下列说法不正确的是（）A.权力的行使应当符合法律赋予该项权力的目的B.案件与处理结果轻重幅度相当C.特殊情形下可以超出法律规定的范围D.同样的情形同样处理 查看答案