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【多選題】
（單選）在使用電磁打點計時器時，有時發(fā)現(xiàn)計時器的打點周期不穩(wěn)定，其原因可能是（）
A.
交流電源的電壓不穩(wěn)定
B.
交流電源的頻率不穩(wěn)定
C.
永久磁鐵的磁性太弱
D.
振片的固有頻率與交流電源的頻率有偏差
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舉報參考答案：
舉一反三
【單選題】I think that the work is well done __________ .
A.
on the way
B.
in the way
C.
in a way
D.
on a way
【單選題】Species (物種) must change as the environment changes ，or they will _________ . .
A.
die out
B.
die away
C.
die off
D.
die from
【單選題】He went out __________ a doctor for his sick wife .
A.
in return for
B.
in charge of
C.
in er of
D.
in search of
【單選題】So , what can women do to _________ themselves _________ heart disease ? .
A.
spread ; from
B.
protect ; from
C.
keep ; back
D.
cure ; from
【單選題】She ‘s absolutely determined to ____________ in life .
A.
achieve
B.
win
C.
succeed
D.
gain
相關(guān)題目：
【單選題】I think that the work is well done __________ .
A.
on the way
B.
in the way
C.
in a way
D.
on a way
【單選題】Species (物種) must change as the environment changes ，or they will _________ . .
A.
die out
B.
die away
C.
die off
D.
die from
【單選題】He went out __________ a doctor for his sick wife .
A.
in return for
B.
in charge of
C.
in er of
D.
in search of
【單選題】So , what can women do to _________ themselves _________ heart disease ? .
A.
spread ; from
B.
protect ; from
C.
keep ; back
D.
cure ; from
【單選題】She ‘s absolutely determined to ____________ in life .
A.
achieve
B.
win
C.
succeed
D.
gain
參考解析：
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