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【判断题】
三相对称正弦电压其频率相同、幅值相等、相位互差120度,其瞬时值之和为零。
A.
正确
B.
错误
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【单选题】一般情况下油漆在4h可达到表面干燥,但完全干燥需▁▁h以上,每一度油漆没干透不能涂刷第二度,否则会引起皱纹或龟裂。
A.
24;
B.
8;
C.
12;
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【单选题】一 般情况下油漆在 4h可达到表面干燥,但完全干_ h以上,每一度油漆没干透不能涂刷燥需第二度,否则会引起皱纹或龟裂。
A.
24
B.
8
C.
12
【单选题】一般情况下油漆在4h可达到表面干燥,但完全干燥需 h,以上每一次油漆没干透不能涂刷第二度漆,否则会引起皱纹或龟裂
A.
24
B.
8
C.
12
【单选题】I bought two teddy bears. One is for my sister, ______ is for my friend Tom. [     ]
A.
the another
B.
the other
C.
others
D.
another
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