單項(xiàng)選擇題

The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to （）.

A.secure and tag the electrical circuit
B.place a crow bar in the flywheel of the unit
C.inform all persons in the area not to start the unit
D.make a log book entry

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單項(xiàng)選擇題

One of the main differences between the various types of screw pumps is in the （）.

A.stuffing box diameter
B.direction of rotation of the screws
C.pitch of the screws
D.type of driving gears

單項(xiàng)選擇題

The temperature at which water vapor in the atmosphere begins to condense is called the （）.

A.dew point temperature
B.condensation temperature
C.psychometric temperature
D.absolute humidity temperature

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The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to （）.

你可能感興趣的試題

One of the main differences between the various types of screw pumps is in the （）.

The temperature at which water vapor in the atmosphere begins to condense is called the （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精