单项选择题

以下哪些是水果的艺术形式？

A、果树盆景
B、水果拼盘
C、果核雕刻
D、门楣艺术以及现代的果实帖字

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单项选择题

A clean on-board B/L, made out to order and blank endorsed is a B/L on which ( ).

A、the consignee is "to order"
B、the consignee is blank
C、freight prepaid must be marked
D、there should be no mark indicating the package of the goods is broken or damaged
E、there should be no mark indicating the package of the goods is not brand new
F、there should be no name of the transferor
G、there should be no name of the transferee

电涡流传感器的工作原理是（）。

答案：电涡流传感器的工作原理是基于电磁感应原理。当交流电流通过传感器头部的线圈时，会在其周围产生一个交变磁场。当这个交变磁场与...