对于墙面有抹灰的踢脚板,层层砂浆和面砂浆可以一次抹成。( )
参考答案:错
--- Lucy practicing playing the piano right now? ---Yes, she .
A.Do; do
B.Does; does
C.Is; is
D.Is; does
采煤机减速箱组装时,机壳没有左右之分,可以翻转180°使用。