SL50型水龙头最大载荷是()。
A、600kN
B、675kN
C、750kN
D、800kN
参考答案:B
简要说明行情预测的一般步骤。
—If you go to the post office, would you please get me a stamp?
--I am ___ willing to.
A.no more than
B.not more than
C.more than
D.no less than