东北地区的秋末或冬初的灌水称为“灌冻水”或“封冻水”，可以提高树木的越冬能力，属于休眠期灌水。
参考答案：错
— He hardly spent any time on his subjects, _________?
—_________, so he did badly in his lessons.
A．didn’t he; Yes
B．did he; Yes
C．didn’t he; No
D．did he; No
石料经洛杉矶式磨耗机磨耗取出后，应选( )mm的方孔筛，筛去试样中被撞击磨碎的石屑。
A．2.36
B．1.25
C．1.6
D．1.7
