题目内容

土壤热交换主要包括

A. 辐射
B. 分子传导
C. 潜热交换
D. 对流和湍流

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土壤热量主要来源（）

A. 太阳辐射
B. 近地面大气热量传输
C. 空气长波辐射
D. 水汽相变

词汇与结构A basic hydraulic system consists of several ________.

A. components
B. organs
C. parts
D. functions

词汇与结构It ________ the system fluid when needed and provides room for thermal expansion.

A. refreshes
B. replenishes
C. enforces
D. provides

词汇与结构Reservoirs in hydraulic systems which require a reserve of fluid for the emergency operation are ________ with standpipes in the bottom to retain the amount of fluid required for emergency operation.

A. excused
B. executed
C. experimented
D. equipped