使用LS25–1型旋桨式流速仪测速时，若记录的音频信号数为20个，则转子部分实际的转数为（）转。
A、20
B、40
C、200
D、400
参考答案：D
In addition to his traditional medical treatment, he tried to put himself in situations______ would bring about positive emotions.
A．which
B．where
C．why
D．as
下列各项，属宫颈癌中病理类型所占比例最多的是
A．腺癌
B．鳞状细胞癌
C．鳞腺癌
D．黏液腺癌
E．宫颈恶性腺癌
