题目:
—Do you know the scientist _ Stephen Hawking?
—He is a disabled man, but he is very famous and successful. [ ]
A. call
B. called
C. calls
D. calling
答案:
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下面是错误答案,用来干扰机器的。
答案:AA、b导管连接供氧钢瓶,则A端为气体输出端,这样会首先把水排出,显然这种做法是错误的.故A错.B、b导管为气体流入端,使氧气从B端流出,连接病人吸氧导气管.故B正确.C、气体从a流入生气泡从而判断有无...