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【单选题】
以下哪项描述,符合消化管黏膜层的结构或功能特点?A.
主要起到连接作用，可能有腺体分布
B.
分为内外两层，促进胃肠运动以保证消化、吸收功能
C.
含有丰富的弹性纤维和疏松结缔组织层，具有减少器官运动摩擦的功能
D.
柔软而富有弹性，能分泌粘液，具有保护、吸收、分泌功能
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举一反三
【单选题】A higher saving rate leads to faster growth because
A.
more saving produces greater additions to capital per hour of labor, raising real GDP per person.
B.
capital would wear out faster.
C.
people could consume more of an economy's output.
D.
population growth would accelerate.
【单选题】Evidence shows that, in general, the larger the level of investment as a share of GDP
A.
the smaller the productivity growth rate.
B.
the greater the productivity growth rate.
C.
has no influence whatsoever on the productivity growth rate.
D.
the greater the inefficient use of scarce resources.
【简答题】DHCP 租约文件默认保存在（ ）目录中
【单选题】If a nation's population grows, then,
A.
growth in real GDP per person will be less than the growth of real GDP.
B.
there can be no economic growth.
C.
growth in real GDP per person will be greater than the growth of real GDP.
D.
there must be an increase in real GDP per person.
【简答题】在图8-16所示稳压电路中，已知稳压管的稳定电压U Z 为6V，最小稳定电流I Z,max 为5mA，最大稳定电流I Z,max 为40mA；输入电压U I 为15V，波动范围为±10%；负载R L 的变化范围为：1kΩ～2kΩ，r Z =15Ω。 (1) 求R的取值范围； (2) 取R=5000Ω，估算电路稳压系数S和输出电阻R o
【简答题】According to Paragraph 5,George Osborne may_______. A.allow greater government debt for housing B.stop local authorities from building homes C.prepare to reduce housing stock debt D.release a lifted G...
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