电热水器实用控制电路中的水位开关只控制水位达到2/6高度才能通电加热。
参考答案:对
He tried to cope with the ever-increasing burden of his work, but finally he _____ and had to take a complete rest.
A.broke in
B.broke down
C.broke out
D.broke up
若一国的国际收支平衡表中,储备资产项目为100亿美元,则表示该国()。
A.增加了100亿美元的储备
B.减少了100亿美元的储备
C.人为的账面平衡,不说明问题
D.无法判断