（）是中国古代重要的打击乐器，由数件钟组成，形状、大小依次不等（排列）。
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远期结售汇固定交割日交易的期限为（）
A. 7天
B. 20天
C. 1个月
D. 2个月
E. 3个月
DDZ－Ⅲ型仪表的电源为24VDC，标准输出信号为4～20mADC。（）
A. 正确
B. 错误
Which of the following precautions should always be carried out in dry dock?（）
A. Liquids should never be transferred between tanks without consulting the dock master
B. If sea valves have been disassembled, all bonnets must be checked for leakage when the ship is re-floated
C. Before re-floating, all sea chest strainers should be verified as having been replaced
D. All of the above
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