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【多选题】
关于原始消化管形成的描述哪项错误A.
羊膜囊被包卷入胚体内形成
B.
起初是一条开放的管道
C.
头端和尾端分别有口咽膜和泄殖腔膜封闭
D.
分化为消化系统和呼吸系统大多数器官的黏膜上皮和腺体
E.
分前肠、中肠、后肠
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【单选题】This is one of the few best films _____ highly thought of by the public. [ ]
A.
which is
B.
that are
C.
that is
D.
which are
【单选题】This is one of the longest bridges that ______ on this river.
A.
is ever built
B.
have ever been built
C.
was ever built
D.
has ever been built
【单选题】This is one of the means ____t he electic energy is conducted from one place to another.
A.
by which
B.
by that
C.
through which
D.
through that
【单选题】用剪力分配法计算等高排架时，下列表述错误的是
A.
等高排架的柱顶标高必须相同
B.
等高排架柱顶标高可相同，也可不同，但柱顶由倾斜横梁贯通相连
C.
柱顶水平力按排架柱侧向刚度来分配
D.
侧向刚度指使柱顶产生单位水平位移需要施加的柱顶水平力
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