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【单选题】
当监视目标照度有变化时,应采用()。A.
3
B.
电动聚焦镜头
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皮皮学刷刷变学霸
举一反三
【单选题】In the earliest stages of man’s development he had no more need of money than animals have. He was content with very simple forms of shelter from natural materials around him. he made his own rough to...
A.
Man needed little in the earliest stages of development
B.
Man preferred to make tools by himself.
C.
How the simple process of exchange arose.
D.
What the early man needed from others
【简答题】1 device 2 instrument 3 implement Man’s earliest s were carved from stone and bone.
【单选题】下列关于酶原激活的叙述哪一项是正确的
A.
是由部分肽键断裂，酶分子空间构象改变引起的
B.
是由氢键断裂，酶分子的空间构象发生改变引起的
C.
是由低活性的酶形式转变成高活性的酶形式
D.
酶蛋白被化学修饰
E.
是由酶蛋白与辅酶结合而实现的
【单选题】Man’s earliest _______ were carved from stone and bone.
A.
device
B.
instruments
C.
implement
【简答题】 f____ n. 肥料
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