《煤矿安全规程》规定:作业场所空气中呼吸性粉尘(粉尘中游离SiO2含量<10%)浓度不得超过()mg/m3。
A、3.5
B、1
C、0.5
参考答案:A
______ is in the classroom. In fact many students were late for school ________me because of the
heavy rain. [ ]
A. No students; except
B. Not every student; besides
C. Not all the students; but
D. No every student; except
“思想不自由,毋宁死耳。”这句话出自()
A.陈寅恪
B.张爱玲
C.汪曾祺
D.叶圣陶