.单程票在售出()分钟内、没有进闸记录且票内信息可以读取的,可在购票车站办理退票。A.60B.30C.20D.10
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患者男,12岁。颈部结块,形如鸡卵,皮色不变,灼热疼痛,边界清楚,伴风温外感症状。治法应为()
A. 清热利湿,和营消肿
B. 清热利湿,和营托毒
C. 散风清热,化痰消肿
D. 清热解毒,和营消肿
E. 清热解毒,活血化瘀
开关柜交接试验,SF6断路器交流耐压试验在SF6气压为额定值时进行,试验电压按出厂试验电压的()%。
A. 70
B. 80
C. 90
D. 100
CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT What is true about the set? ()
A. The DESCRIBE DEPT statement displays the structure of the DEPT table.
B. The ROLLBACK statement frees the storage space occupies by the DEPT table.
C. The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.
D. The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.
绝热材料的化学性能主要指材料的pH值和氯离子含量,主要考虑绝热材料是否对绝热对象产生()作用。
A. 应力
B. 腐蚀
C. 变形
D. 荷载