卷材防水屋面的找平层宜留分隔缝,分隔缝应留在()处。
A、板端缝
B、板中间
C、离板端2/3处
D、板中2/3跨度范围内
参考答案:A
枸橼酸合剂的配方是()
A.枸橼酸50g,枸橼酸钠100g,加水至1000ml
B.枸橼酸100g,枸橼酸钠100g,加水至1000ml
C.枸橼酸100g,枸橼酸钠50g,加水至1000ml
D.枸橼酸100g,枸橼酸钠150g,加水至1000ml
E.枸橼酸150g,枸橼酸钠150g,加水至1000ml
It's dangerous for you _______ in the street.[ ]
A. play
B. to play
C. played
D. playing