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【单选题】
在下列有关截面核心的结论中,哪一个是错误的? ( )A.
当压力作用于截面核心外部时，杆内既有拉应力，又有压应力
B.
当拉力作用于截面核心外部时，杆内只有压应力
C.
当压力作用于截面核心内部时，杆内只有压应力
D.
当拉力作用于截面核心内部时，杆内只有拉应力
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A.
CIC的一切险
B.
CIC的平安险
C.
CIC平安险和战争险
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