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单选题
2435. Before you install the duct and check valve assembly, you must do an inspection of the check valve to make sure the spring holds the check valve open a short distance
A
You must inspect the check valve to make certain that the spring holds the check valve open a short distance before installing the duct and check valve assembly.
B
Before you installing the duct and check valve assembly, you must check the check valve to make sure the spring holds the check valve open a short distance.
C
You must exam the check valve to ensure the spring holding the check valve open a short distance before mount the duct and check valve assembly.
答案解析
正确答案：A
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