Not until the meeting was over()that he had made a mistake in his speech.
A. he realized
B. did he realize
C. hehas realized
D. has he realized
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整流装置产生的内部过电压由并联于元件两端的()进行保护。
婴幼儿衣服宜柔软、宽大,内衣用纯棉布制品,最好不用扣子。
A. 正确
B. 错误
对于智能非凡,并(或)具有某种突出才能的儿童,下列称呼中错误的是()
A. 我国古代称为“神童”
B. 外国称为“英才”或天才儿童
C. 我国当代称为“天才儿童”
D. 我国当代称为“超常儿童”
由暴雨资料推求设计洪水,主要有()法和()关系法推求来设计面暴雨量。