如果我们需要为用户提供DSL接入服务的话，那么必须拿掉用户线路上的负载线圈。（）
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对一条河流来说，随着季节的不同，水位有所涨落，故航道尺度也会随之而发生变化。
A. 正确
B. 错误
In which cases is reference partitioning effective in enhancing performance？（）
A. It is effective only in partition pruning.
B. It is effective only in partitionwise joins provided that the query predicates are different from the partitioning key.
C. It is effective in both partition pruning as well as partitionwise joins provided that the query predicates are identical to the partitioning key.
D. It is effective in both partition pruning as well as partitionwise joins irrespective of whether the query predicates are different from or identical to the partitioning key.
我是北京某企业职员，打算申请工伤劳动能力鉴定，应该如何办理？需提供哪些资料？
承兑仅适用于商业汇票，是指汇票付款承诺在汇票到期日支付汇票金额并签章的行为。
A. 正确
B. 错误
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