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【多选题】
关于酶的活性说法正确的是A.
多数酶是细胞产生的蛋白质
B.
酶易受pH、温度等外界因素的影响
C.
酶只能加速反应，改变反应平衡点
D.
催化效率极高
E.
有高度特异性
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于仪表使用说法正确的是哪项()
A.
TQX支路板光口灵敏度测试需要使用：10G仪表、可调衰耗器和光功率计
B.
OTDR可以测量出光缆纤芯的色散、光功率衰耗和距离
C.
光功率计可以在线测试业务端口的发光功率
D.
光谱分析仪可以直接测量出100G系统各波的OSNR
【单选题】According to the Stolper-Samuelson theorem, an increase in the price of a country’s imports will:
A.
reduce the returns to all factors of production within the country.
B.
raise the returns to all factors of production within the country.
C.
reduce the returns to the factor of production used relatively intensively in the import-competing industry.
D.
raise the returns to the factor of production used intensively in the import-competing industry.
【单选题】According to the Stolper-Samuelson theorem, international trade leads to:
A.
reduction in the real income of the nation’s relatively abundant factor
B.
reduction in the real income of the nation’s relatively scarce factor
C.
increase in the real income of the nation’s relatively scarce factor
D.
none of the above
【单选题】The Stolper-Samuelson theorem indicates that given certain assumptions and conditions:
A.
a. the real return to the factor used intensively in the import-competing industry will rise in the long-run.
B.
b. the real return to the factor used intensively in the export industry will fall in the long-run.
C.
c. the real return to all the resources in an economy will increase.
D.
d. the real return to the factor used intensively in the export industry will rise in the long-run.
【单选题】The Stolper-Samuelson theorem indicates that given certain assumptions and conditions:
A.
the real return to the factor used intensively in the import-competing industry will rise in the long-run.
B.
the real return to the factor used intensively in the export industry will fall in the long-run.
C.
the real return to all the resources in an economy will increase.
D.
the real return to the factor used intensively in the export industry will rise in the long-run.
【单选题】下列关于光纤光栅的说法，正确的选项是？
A.
第一根光纤光栅是由K. O. Hill等人利用相位掩模技术进行刻写的
B.
Bragg 光纤光栅的光学特性是由向前传输的导模与包层模耦合的结果
C.
啁啾光纤光栅是用来消除旁瓣
D.
长周期光纤光栅透射谱谐振波长与包层周围介质的折射率有关
【单选题】为了删除窗体上的一个控件,下列正确的操作是( )。
A.
按回车键
B.
按 键
C.
选择(单击)要删除的控件，然后按 键
D.
选择(单击)要删除的控件，然后按回车键
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