合同生效的条件包括()
A.订约当事人有订约能力
B.合同形式符合法律要求
C.合同的内容合法
D.合同的目的合法
参考答案:A, B, C, D
He was ______ tired ______ he fell asleep as soon as he lay down. [ ]
A. too; to
B. so; that
C. such; that
D. enough; that
电除尘振打器过流的原因()。
A、输入电压相角角度过大;
B、电磁锤存在卡涩现象;
C、取样线故障;
D、相控板故障。