Sotheyhavesold ______halfoftheir cattleearly.
A. in attendance
B. leave something behind
C. fall ill
D. up to
查看答案
Mary's kindness and patience endeared her to all her students.The translation of this sentence is “玛丽的友善和耐心使她很喜爱她所有的学生。” True or False?
A. 对
B. 错
为降低活塞式压缩机的耗功,应尽量采用()压缩过程
A. 绝热
B. 等容
C. 等温
D. 多变
活塞式压缩机( )压缩时的耗功大于( )压缩时的耗功
A. 多变、定温
B. 定温、绝热
C. 绝热、定温
D. 定温、多变
压气机耗功等于压缩过程耗功。( )
A. 对
B. 错