砂类土在做含水率试验时烘干时间不得少于（）。
A.4h
B.6h
C.8h
D.12h
参考答案：B
He is a successful businessman and he ___ his success more to luck than to ability.
A．attaches
B．adapts
C．owes
D．fastens
下列病证中不宜使用下法治疗的是（）
A.宿食
B.结痰
C.积水
D.蓄血
E.痞块
