【单选题】下列操作不正确的是( )
A.
旋摇分液漏斗时,用一手指末节顶住玻塞,再用大拇指和中指夹住漏斗上口径
B.
食指和中指食指和中指蜷握在活塞柄上握住活塞柄并能自由地旋转
C.
旋摇分液漏斗时将漏斗稍倾斜,漏斗的活塞部分向下
D.
旋摇分液漏斗时将漏斗稍倾斜,漏斗的活塞部分向上
【单选题】Cultural rules determine every aspect of food consumption. Who eats together defines social units. For example, in some societies, the nuclear family is the unit that regularly eats together. The anth...
A.
people who eat together.
B.
the kinds of food served.
C.
snacks and hamburgers.
D.
family members and guests.
【单选题】直接与叶相通的维管束位于茎内的部分,称为( )。
【单选题】关于贾樟柯的《小武》,下列说法错误的是()。
【单选题】在月经周期,LH的释放高峰与卵巢排卵密切相关,LH高峰一经出现,预示多少小时内卵巢开始排卵
【简答题】Cultural rules determine every aspect of food consumption. Who eats together defines social units. For example, in some societies, the nuclear family is the unit that regularly eats together. The anth...
【单选题】直接与叶相通的维管束位于茎内的部分,称为( )。