下列 CHECK 约束条件中哪个总是有效的？&#91; &#93; A: CONSTRAINT gender_chk CHECK(gender IN (N'男',N'女')) B: CONSTRAINT birthday_chk CHECK(birthday > GETDATE()) C: CONSTRAINT mark_chk CHECK(mark<560) D: CONSTRAINT address_chk CHECK(address LIKE N'广州市%')

【单选题】def happy(): print("Happy birthday to you!") def happy_birthday(name): happy() print("Happy birthday, dear {}!".format(name)) happy() happy_birthday("teacher") A. Happy birthday to you! Happy birthday to you! Happy birthday, dear teacher! Happy birthday to you! B. Happy birthday to you! Happy birthday, dear teacher! Happy birthday to you! Happy birthday to you! C. Happy birthday to you! Happy birthday, dear teacher! Happy birthday, dear teacher! Happy birthday to you! D. Happy birthday to you! Happy birthday, dear teacher! Happy birthday to you!

1M1T架控切除切除的开关为（）。 A: CHK B: CHRE C: FC D: LB

有如下代码： StringBuffer buffer = new StringBuffer("Happy Birthday");buffer.insert(2, '5');System.out.println(buffer);则最后输出的结果是（ ） A: Hap5py Birthday B: H5appy Birthday C: Ha5py Birthday D: Ha5ppy Birthday

She is such a difficult girl to please ________. A: when birthday gifts are concerned B: when concerning birthday gifts C: when birthday gifts concerned D: when birthday gifts concerning

--Happy birthday!--______. A: Happy B: Happy birthday C: Thank you

ALT速率法测定时应用的指示酶（） A: AMD B: BLD C: CHK D: DG6PD E: EPOD

​如果要约束学生表的人员必须是“90后“，那么Birthday字段（日期型）应该添加的检查约束时________。‍ A: Birthday>="1990-01-01" B: Birthday>=1990 C: Birthday="90后" D: Birthday>="90后"

从datetime类型的数据列 birthday 中获取年份，正确 的方法是： A: frame['birthday'].dt.year B: frame['birthday'].year C: datetime.now().year D: pd.to_datetime(frame['birthday'])

---Happy birthday!--______