"Before you go into a fuel tank, you must defuel the fuel tank and decrease the fuel fumes to a safe level".The above sentence means"在你进入油箱之前，必须放空油箱，并将燃油烟雾降到安全水平。"
A.1
正确答案是A
"Before you go into a fuel tank, you must defuel the fuel tank and decrease the fuel fumes to a safe level".The above sentence means"在你进入油箱之前，必须放空油箱，并将燃油烟雾降到安全水平。"
A.1
正确答案是A