问题
单项选择题
心脏测量时,为缩小放大率,焦-片距离应为().
A.240cm
B.220cm
C.200cm
D.180cm
E.160cm
答案
参考答案:C
解析:因为焦-片距离为200cm时,可大为减少心脏投影的放大,使心脏接近真实的大小。
心脏测量时,为缩小放大率,焦-片距离应为().
A.240cm
B.220cm
C.200cm
D.180cm
E.160cm
参考答案:C
解析:因为焦-片距离为200cm时,可大为减少心脏投影的放大,使心脏接近真实的大小。
根据所给句子,选择最佳的应答语。每个选项只能用一次。 ( )1. I haven't seen my mother for two years. ( )2. That tall man must be your father. ( )3. Did you hear some strange noise outside our window last night? ( )4. What do you think he is running? ( )5. Can you notice a strange smell in our room? | |
|