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【单选题】
三相半控桥式整流电路电感性负载每个晶闸管电流平均值是输出电流平均值的{.XZ}。
A.
1/6
B.
1/4
C.
1/2
D.
1/3
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【单选题】What is the main purpose of the lecture?
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Fear is the strongest of all emotions.
B.
A feeling of fear affects a person's heartbeat and their senses.
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【单选题】We must be serious to choose the _______ of this shopping mall.
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headquarters   n.  指挥部; 司令部;
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location   n.    定位; 位置，场所;
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spray   vt.        喷; 喷射;n.  喷雾; 浪花;
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