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名词专练Once there lived an unhappy king who slept badly and didn't feel like eating anything. This made the 1 and his people worried. A 2 was called in to examine him. The doctor said it's all in his mind instead of his body. So neither 3 nor rest could help him but a shirt of a happy person. The prime minister was called to the 4 . When hearing the king's situation, he said, "Although I have much 5 , it doesn't make me happy. I'm always worried about losing it. "Then, the king's banker came and said he had lots of wealth, but he also worried about losing it. He was never happy, either. Next, the palace singer came and his 6 were almost the same. Finally, the top general was told to find a happy 7 in three days' time. Luckily, he found a poor man without power, money or fame singing happily on a street. The 8 asked him what made him so happy. The poor man answered that he had everything he wanted and he didn't want those he couldn't have. His songs came from the 9 in his heart. When the general asked for the man's 10 , to his surprise, the man said, "What shirt? I don't own any shirts!"
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【单选题】已知正弦交流电压u=311sin(628t-π/6)V,它的最大值是()
A.
(A)
B.
(B)
C.
(C)
D.
(D)
【单选题】已知正弦交流电压u=311sin(628t-π/6)V,它的最大值是( )。
A.
311V
B.
3112V
C.
311/2V
D.
3113V
【单选题】A hydraulic motor may be driven by______.
A.
an electric motor
B.
a diesel engine
C.
a compressor
D.
oil
【单选题】已知正弦交流电 u=311sin(314t+30°)V,该电压第一次达到311V,需要的时间是
A.
1/30 s
B.
1/60 s
C.
1/300 s
D.
1/600 s
【单选题】已知正弦交流电压u=311 sin(628 t-π/6)V,它的最大值是( )。
A.
311v
B.
311 V
C.
311/ V
D.
311 V
【单选题】确定乳腺肿块性质最可靠的方法是
A.
乳房触诊
B.
乳头溢液涂片
C.
乳房钼靶X线检查
D.
B超
E.
活组织病理检查
【单选题】Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by_____.
A.
leaky discharge valves on the LP cylinder
B.
leaky discharge valves on the HP cylinder
C.
insufficient intercooler cooling
D.
low ambient air pressure
【单选题】轴上有多个键槽时,一般键槽间的布置角度为()。
A.
90°
B.
120°
C.
135°
D.
【单选题】已知正弦交流电u=311sin(314t+30°)V,该电压第一次达到311V,需要的时间是
A.
1/30 S
B.
1/60 S
C.
1/300 S
D.
1/600 S
【单选题】已知正弦交流电压u=311sin(628t-π/6)伏,它的最大值是()伏。
A.
311
B.
311√2
C.
311311√2
D.
311√3
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