安静时细胞膜两侧存在着正常数值的电位差称为（）
A．极化
B．去极化
C．复极化
D．超极化
E．反极化
参考答案：A
下颌下三角的内容不包括（）
A.下颌下腺
B.下颌下淋巴结
C.面静脉
D.面动脉
E.面神经颈支
The successful launch of Shenzhou VII must have immediately excited the Chinese, _____ it? [ ]
A. needn't
B. didn't
C. hasn't
D. mustn't
