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问题 填空题

分别标出如图所示1_______________2_______________3_____________4___________为哪根血管。

答案

参考答案：胼胝体缘动脉；胼胝体周围动脉；旁中央动脉；楔前动脉

单项选择题

血液pH和气体分析的标本不能及时测定时，一般需将它保存在有冰块的水中，这是为了达到以下哪一项的要求

A．防止糖酵解
B．防止CO2气体丧失
C．防止溶血
D．防止血液浓缩
E．防止O2气体丧失
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单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

Is rs=rx-2 （）
(1) r is an odd number
(2) x=s+2

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.
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