砌筑砂浆应随抹随用，施工期间最高气温超过30℃时，水泥砂浆最迟应在多长时间内使用完毕（）
A.2h
B.3h
C.4h
D.5h
参考答案：A
As a general rule, September is the worst month of the year for hurricanes in the Gulf.
A．Normally
B．On rare occasions
C．Invariably
D．Sometimes
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