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【简答题】
A．They defend the bone against viruses. B．They prevent oxygen from entering the bone. C．They break down bone tissue. D．They connect the bone to muscle tissue.
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Refer to Exhibit 3-3. At Point A:
A.
only wine is produced.
B.
only bread is produced.
C.
both wine and bread are produced.
D.
the economy is operating inefficiently.
【单选题】Refer to Exhibit 3-4. The movement from Point D to Point E:
A.
results in an increase in the production of capital goods but a decrease in the production of consumption goods this period.
B.
does not change the level of output produced since both points are on the production possibilities curve.
C.
results in an increase in the production of both capital and consumption goods this period.
D.
results in an increase in the production of consumption goods but a decrease in the production of capital goods this period.
【简答题】防火分区隔墙两侧的防火阀，距墙表面不应大于（）。
【单选题】Refer to Exhibit 3-4. Currently, Point ____ is impossible to achieve.
A.
A
B.
C
C.
E
D.
G
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