以在经皮给药系统中作为渗透促进剂的是（）。A、月桂氮酮 B、聚乙二醇200 C、

重度贫血的标准是血红蛋白为（）

A.120g/L

B.110g/L

C.100g/L

D.90～60g/L

E.60～30g/L

糖尿病视网膜病变按眼底改变可分为两大类_______和________。

排架结构荷载的传递路线依次为( )。

A．屋面板→屋架→柱→基础
B．屋架→吊车梁→柱→基础
C．屋架→墙梁→柱→基础
D．吊车梁→柱间支撑→柱→基础

经济法是国家为了克服市场失灵而制定的调整需要由国家干预的具有（）和社会公共性的经济关系的法律规范的总称。

A.地域性

B.全局性

C.永久性

D.暂时性

Did you ever have someone’s name on the tip of your tongue and yet you were unable to recall it (1) this happens again, do no (2) to recall it. Do something (3) for a couple of minutes, (4) the name may come into your head. The name is there since you have met (5) person and his name. It (6) has to be dug out. The initial effort to recall (7) the mind for operation, but it is the subconscious (8) that go to work to dig up a (9) memory. Forcing yourself to recall (10) never helps because it doesn’t (11) your memory；it only tightens it. Students find the preparatory method help (12) examinations. They read over the questions (13) trying to answer any of them. (14) they answer first the ones (15) which they are most confident. Meanwhile, deeper mental activities in the subconscious mind are taking (16) ; work is being done on the (17) difficult questions. By the time the easier questions are answered, answers (18) the more difficult ones will usually begin to (19) into consciousness. It is often (20) a question of waiting for recall to come to the memory.

15（）

A.of

B.with

C.for

D.in