题目内容

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

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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

词汇与结构When system fluid is lost, emergency fluid is draw from the bottom of the________.

A. preservation
B. reservoir
C. reserve
D. reservation