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【简答题】
测量某电路电流共5次,测得数据(单位为mA)分别为168.41,168.54,168.59,168.40,168.50。试求算术平均值和标准差。
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皮皮学刷刷变学霸
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【单选题】It is obvious that on no account _____ to the teacher that he has done the homework on his own.
A.
this is the first time he is lying
B.
this is the first time he has lied
C.
is this the first time has he lied
D.
is this the first time he has lied
【单选题】_______of the class_______ finished the homework already.
A.
Two third, has
B.
Two thirds, have
C.
Two thirds, has
D.
Second threes, have
【单选题】—I am sorry I _________ my homework at home. —That’s all right. Don’t forget _______ it to school this afternoon.
A.
forgot; to take
B.
forgot; to bring
C.
left; to take
D.
left; to bring
【单选题】— You didn't do your homework _______, Jim. — I'm sorry, Mum. But I haven't got _______ for such things. [ ]
A.
careful enough; enough time
B.
enough careful; time enough
C.
enough carefully; enough time
D.
carefully enough; enough time
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