（）的标志是船舶在一定的装载情况下吃水标志，一般船舶有首、舯、尾三组吃水标记。
参考答案：水尺水线
需要100g的酒精，不用天平，只用量筒，应该量出酒精的体积是_________cm3．（酒精的密度是0.8×103千克/米3）．
-The weather has been very hot and dry.
-Yes. If it had rained even a drop, things would be much better now! And my vegetables _____. [ ]
A. wouldn't die
B. didn't die
C. hadn't died
D. wouldn't have died
