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【单选题】
下列各对元素中,属于类金属元素的是()。A.
Na和K
B.
Ca和Mg
C.
B和Si
D.
Cu和Au
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皮皮学刷刷变学霸
举一反三
【单选题】下列关于酶促化学修饰调节特点的叙述，不正确的是
A.
调节过程一般不消耗能量
B.
催化效率比变构调节效率高
C.
磷酸化和脱磷酸化是最常见的酶促化学修饰
D.
一般属此类调节方式的酶具有(高)活性和无(低)活性形式
【简答题】British['britiʃ]
【简答题】VANCOUVER Vancouver in western Canada is named after Captain George Vancouver of the British Royal Navy. However, Captain Vancouver was not the first European 【C1】______ visit the area. The coast 【C2】...
【简答题】病人为了得到“硬骨头精神”,将整块排骨吞食,此症状为 。
【简答题】British['britiʃ]
【单选题】The main idea of the second paragraph is that ______.
A.
visitors to England think the British policemen are wonderful
B.
the English policemen have become a joke to the visitors
C.
visitors to Britain are very grateful to the policemen for their much help
D.
the British policemen tell the time to the visitors
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