裸于植物中具能游动的精子（称游动精子）的纲有（）。
A.苏铁纲和银杏纲
B.苏铁纲和松柏纲
C.银杏纲和红豆杉纲
D.苏铁纲
参考答案：A
A client who has been admitted to the emergency room is restless and agitated, has dry mucous membranes, and is complaining of intense thirst. The nurse suspects which of the following electrolyte imbalances
A．Hypokalemia.
B．Hypercalcemia.
C．Hypomagnesemia.
D．Hypernatremia.
采用GB2312 汉字编码标准时，某汉字的机内码是BEDF(十六进制)，其对应的区位码是 【2】 。
