【单选题】I/O口中用于存放数据的寄存器名称为

A、输入

B、输出

C、输入输出

A、n. 软件库

B、输入/输出

C、n.实用程序,实用工具

D、vt. 安装;任命;安顿

A、SCC1

B、SCC2

C、SCBR

D、SCDR

A、统一编址

B、独立编址

C、直接编址

D、间接编址

A、27

B、28

C、29

D、30

A、数字输入端

B、数字输出端

C、模拟输出端

D、模拟输入端

A、A．10%

B、B.5%

C、C.15%

D、　D.20%

【单选题】A 20-month-old boy is diagnosed with Hutchinson-Gilford progerial syndrome (HGPS), a severe form of early-onset premature aging. Fetal and early postnatal development are normal, but there is now severe failure to thrive, some lipoatrophy, bony abnormalities, a small, beaked nose and receding mandible, hair loss, and speckled hypopigmentation with some areas of tight hard skin. His neurological and cognitive tests are normal. Genetic analysis shows a single spontaneous mutation in codon 608 of the LMNA gene, which encodes both lamin A and lamin C. Which one of the following would you most likely expect to be a direct effect in cells obtained from this patient?

A、Increased heterochromatin

B、Interference with microtubule treadmilling

C、Increased synthesis of rRNA in the nucleolus

D、Loss of ability to adhere to the basement membrane through integrins

E、Aberrations in nuclear architecture

【单选题】电流I由长直导线1沿垂直bc边方向经a点流入由电阻均匀的导线构成的正三角形线框,再由b点流出,经长直导线2沿cb延长线方向返回电源(如图).若载流直导线1、2和三角形框中的电流在框中心O点产生的磁感强度分别用、和表示,则O点的磁感强度大小

A、B = 0,因为B1 = B2 = B3 = 0.

B、B = 0,因为虽然B1≠ 0、B2≠ 0,但,B3 = 0.

C、B ≠ 0,因为虽然B3 = 0、B1= 0,但B2≠ 0.

D、B ≠ 0,因为虽然,但≠ 0.