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【单选题】
在“2-甲基丙酸”分子中，其烃基是：A.
甲基
B.
乙基
C.
正丙基
D.
异
E.
正丁基
F.
异
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: What time is it? I don't have my watch with me. W: My watch has stopped. I must have forgotten to wind it last night. Let's ask Mary over there. Q: What does the woman suggest? (17)
A.
Winding the watch.
B.
Stopping the watch.
C.
Setting the watch by the radio.
D.
Asking Mary about the time.
【单选题】is wrong with my watch. It has stopped .
A.
Something ； working
B.
Something；to work
C.
Anything ； working
【简答题】___ is
wrong with my watch. It has stopped ___ .A. Something, working B. Something, to work C. Any thing, working D. Anything, to
work
【单选题】无论采用的交直-交变频器是电压型还是电流型,控制部分在结构上均由( )三部分组成。
A.
电压控制、频率控制以及两者协调控制
B.
电压控制、电流控制以及两者协调控制
C.
电压控制、频率控制以及电流控制
D.
电流控制、频率控制以及两者协调控制
【单选题】无论采用交—直—交变频器是电压型还是电流型控制部分在结构上均由（）三部分组成
A.
电压控制、频率控制以及两者的协调控制
B.
电压控制、电流控制以及两者的协调控制
C.
电压控制、电流控制以及频率控制
D.
电流控制、频率控制以及两者的协调控制
【单选题】_____is wrong with my watch. It has stopped _____ [ ]
A.
Something; working
B.
Something; to work
C.
Anything; working
D.
Anything; to work
【单选题】My watch _______ at 10 o'clock, but now it _______. [ ]
A.
went; stopped
B.
was going; stopped
C.
went; is stopping
D.
was going; has stopped
【单选题】My watch has stopped, so I will get it ______ this afternoon.
A.
repaired
B.
repairing
C.
repair
D.
to repair
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