A．He is studying French in Canada.B．He is having a vacation in Canada.C．
A. He is studying French in Canada.
B. He is having a vacation in Canada.
C. He has been back in Canada for weeks.
D. He is planning to return to Canada in a year.
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三相绕线转子异步电动机在转子回路中串电阻可增大起动转矩，所串电阻越大，起动转矩就越大。( )
62
A. desired
B. side
C. little
D. immediate
异步电动机直接起动适用于______情况，降压起动适用于______情况。
女性，l6岁，学生，低热咳嗽3个月，食欲缺乏，消瘦，X线右中肺片状阴影，右肺门淋巴结肿大。最可能的诊断是
A. 原发性肺结核
B. 继发性肺结核
C. 血行播散型肺结核
D. 衣原体肺炎
E. 葡萄球菌肺炎
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