在热水管网的循环方式中，非循环热水供应系统不设()。
A.高位冷水箱
B.回水管
C.水泵
D.热交换器
参考答案：B
—You've got a stomachache? But we ate at the same place. How come my stomach is fine?
—You have an iron stomach! Mine isn't ___ strong. [ ]
A. as
B. such
C. much
D. enough
在组织承诺的各因素中，反映员工对继续留在组织中的义务感的是（）。
A.永久承诺
B.经济承诺
C.继续承诺
D.规范承诺
