下列关于环氧乙烷中毒的临床症状，说法不正确的是（）。
A、口重有咸味
B、剧烈头痛
C、呼吸困难
D、恶心、呕吐
参考答案：A
It was Tom as well as two of his classmates that _______ invited to the party.
A．was
B．were
C．has
D．have
简述制动系的人工排气的步骤？
