斜齿圆柱齿轮的齿数z与模数mn不变，若增大螺旋角则分度圆直径d1（）。
A. 不变
B. 增大
C. 减少
D. 不—定增大或减少
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Consider the following statement on a RANGE partitioned table: ALTER TABLE orders DROP PARTITION p1, p3; What is the outcome of executing the above statement?（）
A syntax error will result as you cannot specify more than one partition in the same statement
B. All data in p1 and p3 partitions are removed and the table definition is changed
C. All data in p1 and p3 partitions are removed, but the table definition remains unchanged
D. Only the first partition (p1) will be dropped as only one can be dropped at any time
一级负荷供电的建筑，当采用自备发电设备作备用电源时，自备发电设备应设置自动和手动启动装置，且自动启动方式应能在（）s内供电。
A. 30
B. 60
C. 90
D. 120
成熟池含有()储存池含有()分裂池含有()从原始粒细胞到中幼粒细胞共分裂()
A. 晚幼粒细胞
B. 杆状核和分叶核细胞
C. 原始粒细胞、早幼粒细胞、中幼粒细胞
D. 4～5次
E. 2～3次
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