45～52 如题45～52图(a)所示，某二级建筑物有一柱下桩基础，采用8根沉管灌注

公安部门要求小型客车的驾驶员和前排乘客必须使用安全带，如图所示．这主要是为了防止高速行驶的汽车在________________时，乘员由于________________而撞伤，使用安全带可以起到保护作用．

男性，32岁，超声示睾丸内可探及多个结节状低回声光团，边界清，CDFI：血流信号丰富。如图所示，考虑为()

A．睾丸脓肿

B．精原细胞瘤

C．睾丸炎

D．睾丸结核

E．睾丸恶性畸胎瘤

长距离光纤传输选用多模光纤。

User programs interact with the kernel through a set of standard (71) . They request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or (72) accounting records; changing ownership of a file or (73) ; changing to a new directory; creating, (74) , or killing a process; enabling access to hardware devices; and setting limits on system resources. Unix is a multi -user, multi -tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It’s the kernel’s job to keep each process and user separate and to regulate access to (75) , including cpu, memory, disk and other L/O devices.

A．deferring

B．suspending

C．hanging

D．holding

有关航海日志的记录，下列何项正确（）。

A.航行中的气象海况在正常情况下每日0800、1200、1600时记录一次

B.主机平均转速、燃料消耗和存量，在正常情况下，每日1600时应记录一次

C.当航向、罗经改正量、风流压差值有变动时，应记录一次

D.以上都正确