四川盆地是我国年太阳辐射总量最少的地区。其主要原因是[ ]
A.海拔低,气温高
B.四周环山,降水少
C.受夏季风影响,云量多、雨雾多
D.纬度低,距海远
答案:C
—I can never forget the day ___ we spent together in the summer camp.
—Well, especially the day _______it suddenly began to rain in the middle of the night.
A.when; when
B.which; when
C.what; that
D.on which; when
最适于观察肾内结构及肾上腺区的体位是()。
A.侧卧位通过侧腰部探查
B.站立位通过侧腰部探查
C.仰卧位通过前腹壁探查
D.半坐位深吸气状态下俯卧位通过背部探查
E.俯卧位通过背部探查