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【判断题】
电动汽油泵使用3000~5000km后,要清洗沉淀杯,打磨触点的接触面,并需将触点开启的间隙调整在0.1~0.3mmA.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】The DiaoYu Island have been part of China’s territory since ancient times, __________as important fishing grounds of Taiwan.
A.
served
B.
serving
C.
to serve
D.
having served
【简答题】对于函数 （1）是否存在实数a，使得函数f（x）是奇函数，若存在求出a值，不存在说明理由； （2）判断函数f（x）的单调性，并证明
【简答题】求 a 的值,使得函数 f ( x )= 在 x =1 处连续
【简答题】Listen to the video clip and match the people with their titles.
【单选题】Who would you rather ________ your place since you are in hospital？
A.
have take
B.
have to take
C.
take
D.
have taken
【单选题】– How long _____ in this job? – Since 1990.
A.
were you employed
B.
have you been employed
C.
have you employed
D.
will you be employed
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