轴向拉伸或压缩杆件,与横截面成()的截面上切应力最大。
A. 45º
B. 90º
C. 30º
D. 60º
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Although goods have been lost or damaged whilst in the custody of the Shipowner,()not necessarily responsible,for his liability in respect of them may have been excluded by the rules of common law or by the express terms of the contract or by statute.
A. she is
B. he is
C. they are
D. it i
不会导致分注井洗井不通的是()
A. 底部洗井阀打不开
B. 油管砂埋
C. 总闸门闸板脱落
D. 水嘴堵
信息检索时,哪种说法是正确的()
A. 任何信息都可以被检索到
B. 学术信息才能被检索到
C. 使用准确、正确的词才能检索到合适的信息
D. 搜索引擎只能检索html格式的信息