柴油车排放的废气中对环境造成的最大污染是铅化合物。
参考答案:错
If you hear the firing of a gun at one minute intervals from another vessel,this indicates that().
A.the gun is being used to sound passing signals
B.the vessel is in distress
C.all vessels are to clear the area
D.all is clear and it is safe to pass
在具体法律关系中,当事人的意志要受法律的制约。 ( )