“三醛胶”是()和()的总称。
参考答案:胶黏剂、脲醛树脂胶黏剂;胶黏剂三类胶黏剂
Put a chopstick into the middle of the glass with water and see what will happen. Choose the right picture.
调用线程的下列方法,不会改变该线程在生命周期中状态的方法是【 】
A.yeild()
B.wait()
C.sleep()
D.isAlive()