蛋白质一级结构的主要化学键是()。
A、氢键
B、疏水键
C、盐键
D、二硫键
E、肽键
A、氢键
B、疏水键
C、盐键
D、二硫键
E、肽键
44 its economy continues to recover, the US is increasingly becoming a nation of part-timers and temporary workers. This " 45 " work force is the most important 46 in American business today, and it is 47 changing the relationship between people and their jobs. The phenomenon provides a way for companies to remain globally competitive 48 avoiding market cycles and the growing burdens 49 by employment rules, healthcare costs and pension plans. For workers it can mean an end to the security, benefits and sense of 50 that came from being a loyal employee.
41. [A] swarm [B] stride [C] separate [D] slip
42. [A] For [B] Because [C] As [D] Since
43. [A] from [B] in [C] on [D] by
44. [A] Even though [B] Now that [C] If only [D] Provided that
45. [A] durable [B] disposable [C] available [D] transferable
46. [A] approach [B] flow [C] fashion [D] trend
47. [A] instantly [B] reversely [C] fundamentally [D] sufficiently
48. [A] but [B] while [C] and [D] whereas
49. [A] imposed [B] restricted [C] illustrated [D] confined
50. [A] excitement [B] conviction [C] enthusiasm [D] importance
B.老年人的健康评估会耗时较长
C.在对老年人口腔进行健康评估时应取下义齿
D.应注意获取客观资料
B.环境标准
C.环境基础标准
D.环境质量标准
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