单选题Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.Aread/sufficientBconsult/sufficientlyCread/sufficientlyDconsult/sufficient
单选题
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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