《规程》规定,采煤工作面的空气温度不得高于()。
A.30℃
B.26℃
C.28℃
D.34℃
参考答案:B
The very ubiquity of electronic communications can have a surprising downside, notes Richard Kohn, a military historian at the University of North Carolina: a wire becomes accustomed to frequent email from her husband, until he can’t get to a computer. And then her anxiety increases.
A.failure
B.underside
C.drawback
D.consequence
当电压互感器出现()情况时,应停用。
A.渗漏严重
B.高压熔丝连续熔断2-3次
C.套管破裂严重
D.有喷油现象