职业伤害的预防对策不包括（）
A.技术对策
B.教育对策
C.法制对策
D.管理对策
E.防治对策
参考答案：E
Color TV was first shown in 1929. It took more than two decades, ________， until 1951, for
color broadcasts to begin in the USA.
A. though B. therefore C. otherwise D. anyway
汽车刹车产生的抱死现象是指车轮产生了（）。
A、纯滚动
B、纯滑移
C、纯滑转
