钢筋在加工及使用前,必须核对有关试验报告,如不符合要求,应停止使用。
参考答案:对
He seems too tired today, and I wonder__________ he got a good sleep last night.
A.when
B.that
C.if
D.where
帆船每分钟行驶0.18千米,摩托艇每分钟行驶0.62千米,两种船都行驶8.5分钟,一共行驶了多少千米?