【单选题】所有交、直流电焊机的金属外壳都必须采取保护接地或接零。接地.接零电阻值应小于()。
【单选题】The boy shouted ___________ the people on the mountains for help.
【单选题】第二部分 阅读理解 从每题所给的四个选项中,选出最佳选项。 ( 每小题 2 分,满分 30 分 ) A A boy and his father went walking in the mountains. Suddenly the boy fell, hurt himself, and cried, “ AAAh !!! ” To his surprise, he heard the voice...
A.
he hurt himself and felt bad
B.
he wanted to give himself a surprise
C.
he felt it was so quiet in the mountain
D.
he hoped his father would help him
【单选题】The little boy shouted with excitement over the newly bought toy.
【单选题】“你方10月8日的发盘,如果改为付款交单,我们就可以接受”属于( ) A. 发盘B.询盘C.还盘D.接受
【单选题】设置一张幻灯片放映时间的命令是()。
A.
“幻灯片放映”功功能卡的“设置幻灯片放映”命令