扣筋在梁上应当绑扎还是不应当绑扎？
参考答案：应当而且必须绑扎。
I saw a man shouting at a driver ___ car was blocking the street
A．of which
B．of whom
C．who
D．whose
呼吸衰竭的诊断依据（）
A.病因
B.临床表现
C.血气分析
D.氧和指数
E.心电图
