当外力去除后,织物不能恢复原状的性能称为()。
A.抗皱性
B.弹性
C.塑性
D.耐磨性
参考答案:C
It ____for the whole weeks. The city will be flooded if it ____ soon..
A.rained; won’t stop.
B.has been raining; doesn't stop.
C.has rained; won’t stop.
D.rained; doesn’t stop.
影响泵效率的因素有哪些?