引入配电盘柜的电缆要求()。
A.排列整齐
B.编号清晰
C.避免交叉
D.固定牢固
参考答案:A, B, C, D
Before I wanted _______ basketball but I _______ run fast. [ ]
A. play, could not
B. to play, can't
C. play the, can't
D. to play, could not
低钙血症的主要临床表现为()
A.心血管症状
B.呼吸症状
C.消化症状
D.神经肌肉症状
E.中枢神经系统症状