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【多选题】
下列关于α-螺旋的描述，正确的是A.
通常为右手螺旋结构
B.
两螺旋之间借二硫键维持其稳定
C.
氨基酸侧链 R 基团分布在螺旋外侧
D.
是典型的蛋白质的二级结构的一种
E.
螺旋中每 3.6 个氨基酸残基为一
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【简答题】桥式起重机的主要技术参数有（）、（）、（）、（）、（）、（）。
【单选题】So involved in his business _________ that he can hardly accompany his wife and child at weekends. [ ]
A.
the manager has become
B.
becomes the manager
C.
has become the manager
D.
has the manager become
【单选题】We can hardly believe his excuse for his late show _______ his car broke down halfway.
A.
why
B.
that
C.
where
D.
as
【单选题】His heart was ______ so violently that he could hardly catch his breath.
A.
bouncing
B.
beating
C.
jumping
D.
punching
【简答题】桥式吊钩起重机的主要技术参数有哪些？
【单选题】Greatly moved by her words, __________.
A.
tears came to his eyes
B.
he could hardly hold back his tears
C.
tears could hardly be held back
D.
his eyes were filled with tears
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