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单选题
To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should （）
A
ground the board
B
avoid reversing the polarity of the leads
C
isolate sensitive components with heat sinks
D
all of the above
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Enquire the health conditions on board.B
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Enquire the fire conditions on board.
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Heave it home as fast as you canB
Heave it home intermittently，between swellsC
Leave the anchor under foot，until the vessel may be brought before the SeaD
Wait for a calm spot between seas，then house it
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