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【多选题】
对SPECT描述正确的是A.
SPECT是透射式成像设备，射线源在人体外部
B.
SPECT的射线源是γ射线
C.
SPECT测得的图像可反映脏器的结构和功能
D.
在图像重建方面，SPECT和X射线CT一般都采用滤波反投影的重建方法
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皮皮学刷刷变学霸
举一反三
【单选题】用盐酸溶液滴定Na2CO3溶液的第一、二个化学计量点可分别用( )为指示剂。
A.
甲基红和甲基橙;
B.
酚酞和甲基橙;
C.
甲基橙和酚酞;
D.
酚酞和甲基红;
E.
溴甲酚绿—甲基红;
【单选题】The of a vessel may tender a Notice of Readiness to the charterer when the vessel ______.
A.
has completed the terms of the charter party
B.
is in all respects ready to load
C.
is in all respects ready to sail
D.
is safely moored or at a suitable anchorage
【单选题】When shall the stand-on vessel in a crossing situation take action to avoid the other vessel?
A.
When a risk of collision exists.
B.
When action by the give-way vessel alone will not pr a collision.
C.
When the bearing to give-way vessel becomes steady.
D.
When the vessels becoming less than 1/2 mile apart.
【单选题】When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
A.
When a risk of collision exists
B.
When action by the give-way vessel alone will not pr a collision
C.
When the bearing to give-way vessel becomes steady
D.
When the vessels become less than 1/2 mile apart
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