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问题 单项选择题

测定混凝土凝结时间试验方法适用与从混凝土拌合物中筛除的砂浆用贯入阻力来确定坍落度（）的混凝土拌合物

A.不为零

B.不大于180mm

C.不大于90mm

D.不大于220mm

答案

参考答案：A

单项选择题

急性水肿型胰腺炎的腹部体征有（）

A.上腹部肌紧张及反跳痛不明显

B.腹膜刺激征明显

C.脐周或两侧腹出现青紫

D.肠鸣音消失

E.肝浊音界消失
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单项选择题

A shipment of banners contains banners of two different shapes, triangular and square, and two different colors, red and green. In a particular shipment 26%of the banners are square and 35% of the banners are red. If 60% of the red banners in the shipment are square, what is the ratio of red triangular banners to green triangular banners ？（）

A.A

B.B

C.C

D.D

E.E
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