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【简答题】
在三相笼式电动机的正反转控制电路中,为了避免主电路的电源两相短路采取的措施是 。
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举一反三
【单选题】the aftemoon he often plays computer games. But yesterday afternoon he did some washing. [ ]
A.
In; in
B.
/; in
C.
In; /
D.
/; /
【简答题】估算。 19×39≈ 31×21≈ 42×59≈ 13×28≈ 48×29≈ 51×51≈
【单选题】—What does your uncle do? —_____. [ ]
A.
He is Mr Green
B.
He is from Japan
C.
He often plays tennis after school
D.
He is a worker
【简答题】估算 74×22≈ 51×68≈ 59×92≈ 298+205≈ 432-228≈ 82÷8≈ 38×53≈ 77÷4≈
【简答题】47×67+35 2 -51×59+0.0 ． 7 +14.9 ． 2 =______．
【单选题】The boy often _________basketball after school. But now he _________piano.
A.
plays; is playing the
B.
play the; plays
C.
is playing the; is playing
D.
plays the; is playing
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