[填空题] “（）”是作家许地山的笔名。

Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which UPDATE statement is valid?（） ["UPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;","UPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;","UPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;","UPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180"] 溶源性 为保证导线有足够的机械强度，规定截面积不能小于（）。 ["0.5mm^{2<\/sup>","0.8mm2<\/sup>","1.0mm2<\/sup>","0.25mm2<\/sup>"] 对象的Name属性值可以为空 男性患者，36岁，入院确诊为原发性甲状腺功能亢进症。清晨患者起床前，护士测得脉率108/min，血压140/88mmHg，拟在服用复方碘化钾溶液等术前准备后择期行甲状腺大部分切除术。。术前服用碘剂的作用是（） ["抑制甲状腺合成","对抗甲状腺素作用","促进甲状腺素合成","抑制甲状腺素释放","减少促甲状腺激素分泌"] “（）”是作家许地山的笔名。}