环氧乙烷最大的缺点是（）
A、穿透力弱
B、易燃
C、易爆
D、有毒性
E、无毒性
参考答案：B, C, D
国家电网公司管理理念是:集团化、集约化、精细化、（）。
Which of the following best describes the speaker of T. S. Eliot's "The Love Song of J. Alfred Prufrock"
A. He is a man of inactivity. B. He is a man of kindness.C. He is a man of action. D. He is a man of ambition.
