自动化主站系统进入1+N状态后，以下哪些描述是正确的（）
A. 系统仍然保持正常运转
B. 数据更新类和查询类服务暂停
C. 1+N期间发生的历史数据不会丢失
D. 系统恢复正常时能够自动恢复
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Which three statements are true about memory buffer allocation by a MySQL Server?（）
A. Global buffers such as the InnoDB buffer pool are allocated after the server starts, and are never freed
B. Thread buffers are allocated when a client connects, and are freed when the client disconnects
C. Buffers that are needed for certain operation are allocated when the operation starts, and freed when it ends
D. User buffers are allocated at server startup and freed when the user is dropped
E. All dynamic buffers that are set with a SET GLOBAL statement immediately get allocated globally, and are never freed
均重货物使用60t、61t平车装载，两端均衡突出时，其突出车端长度4500mm≤1≤5000mm其装载重量不得超过（）。
A. 58t
B. 56t
C. 54t
D. 52t
以保证担保方式核定授信额度的。小企业客户授信额度不超过保证人担保额度。对采用保证担保方式，以及抵（质）押与保证担保组合方式的小企业，客户授信额度一般不超过客户授信月份之前12个月销售归行额的（）。
A. 60%
B. 50%
C. 40%
D. 30%
下面哪一个属于新一轮退耕还林造林失败（）。
A. 造林成活率≤65％
B. 造林成活率≤50％
C. 造林成活率≤40％
D. 造林成活率≤20％
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