A:
B:
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D:
-I will go to the countryside to see my grandmother this afternoon, so I can't go swimming with you.
-___________.
量筒的用途是____,使用时,量筒必须____,视线要跟____.保持水平.如图中量筒内液体的读数是____mL.
下列选项中没有错别字的是( )
拖拉机油箱中的柴油用掉一半后,关于油箱内柴油的说法正确的是 ( )