何首乌异型维管束的存在部位是（）A．皮层 B．韧皮部 C．木质部 D．木栓层内方和韧

低钾血症

A．血清钾低于 5.5 mmol/L

B．血清钾低于 3.2 mmol/L

C．血清钾低于 3.0 mmol/L

D．血清钾低于 3.5 mmol/L

E．血清钾低于 4.5 mmol/L

Directions:This section consists of three groups of pairs listed in two columns, A and B. You are to match the one marked 1), 2), 3) ,4) or 5) in Column A with the one marked a, b, c, d or e in Column B. One point is given to each pair you match.
1) ______ Jean Piaget
2) ______ M. A. K. Halliday
3) ______ J. Schumann
4) ______ Joseph H. Greenberg
5) ______ B.F. Skinner
a) field, tenor and mode concept
b) neo-behaviourism
c) cognitive psychology
d) the hypothesis of linguistic universals
e) the acculturation theory

下列哪项不是重症药疹的特点（）

A.皮损广泛

B.全身症状明显

C.皮损进展快

D.尼氏征均阳性

请计算代码694548470012X校验码是（）。

A、5

B、6

C、7

D、8

石膏和石灰既是间接肥料又是化学肥料。