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【单选题】
（）是指以D/A或T/T方式结算的交易中，根据申请人的申请，银行在其已承兑的汇票上加注“PerAval”字样，并签注加签银行名称，或银行在接到申请人进口的申请书和有效承兑的商业汇票后以电子方式对外承兑，从而构成汇票签注银行对申请人到期付款的不可撤销担保责任。A.
保释金担保
B.
付款担保
C.
质量维修担保
D.
进口保付
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举一反三
【简答题】Basal bodies that organize the microtubules within cilia and flagella are believed to be derived from ( ).
【判断题】The microtubules and microfilaments of the cytoskeleton are dynamic polymers that are subject to shortening, lengthening, disassembly, and reassembly.
A.
正确
B.
错误
【单选题】The general functions of ( ) is to increase the stabiliy of microtubules and to promote microtubule assembly.
A.
MTOC
B.
MAP
C.
G-actin
D.
lamina
【简答题】简述地形图中符号按地图要素的分类。
【简答题】请将 “ 练习题讲义 ” 中的 “ 练习2 ” 部分各题的答案写下来。
【单选题】When a cell has differentiated into a specialized cell type, the dynamic instability of its microtubules is often ___________ by proteins that bind to the ends or the sides of the microtubules and pro...
A.
augmented
B.
balanced
C.
suppressed
D.
promoted
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