单位符号没有( )，不得附加任何其他标记或符号来表示量的特性或测量过程的信息。
A. 单数形式
B. 复数形式
C. 组合形式
D. 整数形式
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客户资产管理业务中，下列项目属于证券公司享有的权利的是( )。
A. 收取交易手续费
B. 收取交易佣金
C. 收取客户资产管理报酬
D. 收取交易印花税
According to the passage, which of the following is true concerning optical computers
A. Researchers have not yet discovered a means of transporting photons more efficiently.
B. Their primary limitation is the density of connections required between electronic microchip gates.
C. Their accuracy level is poor at 8 to 11 bits, but still superior to that of electronic computers.
D. They invariably rely on electronic circuits to preprocess input data for computation.
E. Both analog and digital forms of optic computing are presently being developed by scientists.
加速度计量单位的符号是m/s2，其单位名称是( )。
A. 米每二次方秒
B. 米每平方秒
C. 每秒每秒米
D. 二次方秒每米
下列各项中，不属于SI基本单位符号的是( )。
A. m
B. A
C. V
D. cd
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