A:were offered
B:will offer
C:have offered
D:will be offered
架在A,B两根晾衣杆之间的均匀铁丝在夏、冬两季由于热胀冷缩的效应,铁丝呈现如图所示的两种形状.下列说法中正确的是( )
关于晶体和非晶体下列说法中错误的是( )
I used to _____ to work. To keep healthy, I am used to ______ to work now.
有关细菌的形态,说法不正确的是( )