为观察脊柱软组织,常取窗宽、窗位是
A. 60HU、20HU
B. 200~350HU、35~HU
C. 400HU、35HU
D. 80-100HU、35HU
E. 1000-1500HU、350HU
注入造影剂后,初期增强效应比较明显的器官是( )
A. 肝
B. 胆
C. 肾
D. 胰
E. 脾答案C79 血管内造影剂浓度高且维持时间长的造影剂 注射方法是( ) A.点滴灌注法 B.团注法 C.滴注~大量快注法 D.大量快注~滴注法 E.多次大剂量急速注射法
In America, ____ car is ____ popular means of transportation.
A. the, the
B. a, the
C. the, /
D. the, a
---- What happened? ---- They left in such ____ hurry that they forgot to lock ____ door.
A. a, a
B. a, the
C. /, the
D. /, a
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