问题
单项选择题
凝血酶的主要作用是
A．激活因子Ⅻ
B．促进血小板聚集
C．使纤维蛋白原转变为纤维蛋白
D．加速因子Ⅶ复合物的形成
E．加速凝血酶原复合物的形成
答案
参考答案：C
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凝血酶的主要作用是
A．激活因子Ⅻ
B．促进血小板聚集
C．使纤维蛋白原转变为纤维蛋白
D．加速因子Ⅶ复合物的形成
E．加速凝血酶原复合物的形成
参考答案：C
| Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can best adapt them selves to such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. (53) they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (54) that comes from achieving success and knowing that their accomplishments are (55) by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (56) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (57) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide (58) opportunities for leadership, as well as for practice in successful (59) dynamics. Making friends is extremely important to teenagers, and many shy students need the (60) of some kind of organization with a supportive adult barely visible in the background. |
A．durable
B．excessive
C．surplus
D．multiple