关于肾脏的叙述，错误的是A．肾实质分为皮质和髓质两部分B．肾皮质主要由肾小体构成C．

下图为某岛屿地质地貌示意图，读图完成小题。

小题1:甲处属于                                                     (　　)。

A．背斜山

B．背斜谷

C．向斜山

D．向斜谷小题2:乙侧河岸                                                     (　　)。

A．形成冲积扇

B．适宜建设港口

C．河流流速较慢

D．多位于河流上游小题3:该处矿床最可能是                                                 (　　)。

A．大理石

B．天然气

C．煤炭

D．石油

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols,applications, and other components.

A．in general

B．in any term

C．in set terms

D．in terms of

TK981型应急电源在交流电源停电后设备可自动或手动转为蓄电池向负载供电，同时设置了（）补偿电路、蓄电池过充/过放保护电路。

A.温度

B.湿度

C.密度

D.高度

75岁男性患者，数月来头晕、乏力、心悸，近一周发生两次晕厥。心电图检查为窦性心动过缓，Holter检查示24小时内发生多次长间歇，最长达6s，长间歇内无P波存在。为防止再次发生晕厥，最佳的治疗措施是（）

A.阿托品

B.异丙基肾上腺素

C.AAI心脏起搏器

D.VVI心脏起搏器

E.VDD心脏起搏器

食物链中的各营养层次称为______。