钢管钢架架设后，钢管内要注满（）。
参考答案：水泥砂浆
—What beautiful shoes you're wearing! They must be expensive.
—No. they only 10 yuan. [ ]
A. spent
B. took
C. paid
D. cost
ABO抗原遗传的"三复等位基因"学说认为，ABO血型基因型有（）
A.3种
B.4种
C.5种
D.6种
E.7种
