【单选题】在工频 X 线机中,下列元件不属于灯丝加热变压器初级电路的是( )
【单选题】白内障术前检查错误的是:
A.
眼科手术不需要行全身系统检查,不需要排除心、脑等全身疾病
D.
眼部专科检查:视力、视野 、光感、光定位、红绿色觉、角膜、前房、虹膜、瞳孔、视网膜、排除影响视觉的其它眼部疾病及眼部活动性炎症
E.
测眼压排除青光眼;角膜曲率和眼轴测量,用以计算人工晶体的度数等
【单选题】设一组初始记录关键字序列为(13,18,24,35,47,50,62,83,90,115,134),则利用二分法查找关键字90需要比较的关键字个数为( )
【单选题】Definition of Nucleic acid Hybridization
A.
It is based on the observation that two single-stranded nucleic acid molecules of complementary base sequence can form a double stranded hybrid.
B.
Technique whereby two different types of cells (from one organism or from different species) are joined to produce one cell with one, continuous plasma membrane .
C.
T he specimen is illuminated by a finely focused laser beam that rapidly scans across the specimen at a single depth, thus illuminating only a thin plane (or “optical section”) within the specimen .
D.
The smallest distance between two points on a specimen that can still be distinguished as two separate entities .
E.
They are made by identical immune cells from a unique parent cell .
【简答题】组合体投影图看图的一般顺序是( )。 A.A.先看主要部分,后看次要部分 B.B.先看细节形状,后看整体形状 C.C.先看整体形状,后看细节形状 D.D.先看难于确定的部分,后看容易确定的部分 E.E.先看容易确定的部分,后看难于确定的部分
【单选题】异步时序电路中的各触发器的状态转换( )时刻进行的。
【单选题】Which one of the following states a principle regarding viral nucleic acid?
A.
Viruses contain both RNA and DNA
B.
Some viruses contain a segmented genome
C.
Purified viral nucleic acid from any virus is usually infectious
D.
Viral genome sizes are similar among known human viruses
【多选题】由于基础资料的占有程度和研究深度与可靠程度各不相同,建设前期的各个工作阶段的( )等各不相同。