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搜题
【单选题】
按照人体触及带电体的电流通过人体的途径，火场触电可分为()种。A.
两
B.
三
C.
四
D.
五
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
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
【单选题】The Diaoyu islands have been part of China's territory since ancient times, ________ as important fishing grounds of Taiwan.
A.
served
B.
to serve
C.
serving
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 finish the following sentences.
【简答题】Listen to the video clip and match the people with their titles.
【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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