单项选择题

锌矿砂 ( )

A．16
B．19
C．15
D．18
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单项选择题
碳同位素(碳13) ( )
A．30
B．17
C．20
D．31
单项选择题
In the foreign trade business, the payment is always made by L C．In this sentence, L C is the abbreviation for ______.
A．bill of Lading
B．commercial Invoice
C．buying Contract
D．letter of Credit
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