【单选题】做单臂横摆式手势时,大臂自然放松,以肘关节为轴,与腰间成( )角。
【多选题】在教育过程,教师作用于儿童的教育行为主要有
B.
体现教师主导的,儿童以接受式学习为主的呈示行为;
C.
体现双边活动的以启发式、互动式为主的对话行为;
D.
儿童自主活动过程师幼互动和个性化教育的指导行为。
【单选题】The pressure fueling system _______ you refuel all tanks.
【多选题】通常在使用应变片作为传感元件时采用差动式结构的目的有:
【简答题】假设 3 个关系: S(S#,SNAME,,AGE) SC(S#,C#,GRADE) C(C#,CNAME,TEACHER) 试用关系表达式,元组关系演算表达式表示下列查询语句: ( 1 )建设 LIU 老师所授课程的课程号和课程名; ( 2 )检索年龄大于 23 岁的男同学的学号和姓名; ( 3 )检索学号位 S3 的学生所学课程的课程名与任课教师名; ( 4 )检索至少选修 LIU 老师...
【单选题】Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?()
A.
Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill
B.
Air pockets may cause the fuel to bubble out of the ullage hole
C.
The temperature rise of the fuel will cause an overflow
D.
Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
【单选题】—What are these? —They’re _______ and _______.