Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.<br>A:read/sufficient<br>B:consult/sufficiently<br>C:read/sufficiently<br>D:consult/sufficient

Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.
A:read/sufficient
B:consult/sufficiently
C:read/sufficiently
D:consult/sufficient

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