【单选题】为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期逢单者用A药,逢双者用B药,问A.B两药的疗效有无差别
B.
P<0.05.两样本均数有差别< /div>
C.
P<0.05.两总体均数有差别< /div>
【单选题】We wish to ______you that the first item you enquired for is out of stock.
【单选题】为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期逢单者用A药,逢双者用B药,问A.B两药的疗效有无差别
【多选题】How do intermediate filaments strengthen cells against mechanical stress?
A.
Intermediate filaments are particularly prominent in the cytoplasm of cells that are subject to mechanical stress.
B.
They are present in large numbers, for example, along the length of nerve cell axons, providing essential internal reinforcement to these extremely long and fine cell extensions.
C.
They are also abundant in muscle cells and in epithelial cells such as those of the skin. In all these cells, intermediate filaments distribute the effects of locally applied forces, thereby keeping cells and their membranes from tearing in response to mechanical shear.
D.
A similar principle is used to strengthen composite materials such as fiberglass or reinforced concrete, in which tension-bearing linear elements such as carbon fibers (in fiberglass) or steel bars (in concrete) are embedded in a space-filling matrix to give the material strength.
【简答题】We wish to ( )first-hand information.
【单选题】为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期逢单者用A药,逢双者用B药,问A.B两药的疗效有无差别