I saw him ______ away on a stretcher (担架).
A. carried
B. carrying
C. to be carried
D. being carried
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She was not interested in the question ______.
A. discussing
B. be discussed
C. being discussed
D. to discuss
运用后代选择器将下面的
标签内的字变为蓝色,下面选项正确的是()
沧海月明珠有泪,蓝田日暖玉生烟
A. div p{color:blue;}
B. div+p{color:blue;}
C. div~p{color:blue;}
D. div>p{color:blue;}
电压型逆变电路,输出( )为方波。
A. 电压
B. 电流
三相电压型相控逆变电路中,为了防止同一相上下两桥臂的开关器件同时导通而引起直流侧电源的短路,要采取“先通后断”的方法。
A. 对
B. 错