在开放的经济条件下,一国国际收支理想的状况是( )。
A.收大于支,形成大量外汇结存
B.收略大于支,形成小量外汇
C.收支相等
D.支大于收,动用外汇储备弥补
参考答案:B
Tom was about to close the window______________ his attention was caught by a bird. [ ]
A. when
B. if
C. and
D. till
关于MRI多时相动态增强扫描的适应证,包括()
A.肝脏、脾脏、胰腺
B.肾脏、肾上腺
C.脑垂体、乳腺
D.外伤导致的四肢骨折
E.骨梗死性病变