Hardly（）when the lights went out.
A. the performance had begun
B. had the performance begun
C. the performance began
D. did the performance begin
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关于CT图像像素的叙述，不正确的是
A. 像素是扫描野和矩阵的比值
B. 实际工作中改变扫描野则可以改变像素的大小
C. 每一个像素可以用CT值表示
D. 扫描野越大则像素越多，故扫描野越大越好
E. 在CT图像中一般CT值较低的像素被转化为黑色
（）I know, he has never worked in that company. He probably told a lie.
As long as
B. As far as
C. As well as
D. As soon as
上机票的钱，可以抵销超期罚款吗
A. 可以。
B. 不可以。
C. 不一定。
D. 以上三个都对。
脏器功能测定、脏器显像以及体外放射分析等其共同原理是
A. 动态分布原理
B. 射线能使物质感光的原理
C. 稀释法原理
D. 物质转化原理 E．示踪技术的原理
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