德川幕府第一次锁国令颁布于( )年。
A. 1632
B. 1633
C. 1634
D. 1639
德川幕府在1633年至1854年实行了长达200多年的锁国政策。
A. 对
B. 错
Fill in the blanks with the information you heard. 1) Q: When will the students start their next important life stage?A: When they finish their ______(1)_______ and get their ____(2)____ .2) Q: What if the students have no idea what to do in the future?A: They don’t need to worry because they still have time to figure out_______(3)_______.
立式壳管式冷凝器属于( )冷凝器。
A. 水冷式
B. 风冷式
C. 蒸发式
D. 套管式