【单选题】立式车床每次下降或上升横梁时,应先将横梁上升或下降mm,这是为了消除间隙,以保持其( )精度。
【单选题】立式车床每次下降或上升横梁时,应先将横梁上升或下降mm,这是为了消除(),以保持其位置精度。
【单选题】Education should not be considered to be a(n) ______ in a modern society.
【单选题】According to Confucius, _____ would be considered to be filial.
A.
to provide enough food to parents
B.
to let parents travel around the world
C.
to give parents a lot of money
D.
to provide parents with enough food and show respect to them as well
【单选题】立式车床横梁每次下降或上升时,应先将()上升或下降20~30mm后再下降或上升,这是为了消除间隙,以保持其位置精度
【单选题】立式车床每次下降或上升横梁时,应先将横梁上升或下降()mm,这是为了消除间隙,以保持其位置精度。
【单选题】立式车床横梁每次下降或者上升时,应先将横梁上升或下降20~30mm后再下降或上升,这是为了消除(),以保持其位置精度
【单选题】立式车床每次下降或上升横梁时,应先将横梁上升或下降mm,这是为了消除间隙,以保持其()精度。
【单选题】Cancer should be considered to be a biological problem rather than a medical one because ______.
A.
viruses are known to cause cancer in animals
B.
at present, human cancer is not believed to be contagious (传染的)
C.
there are many known causes for the transformation of a normal cell to a cancer cell
D.
results of experiments on plants and animals do not vary greatly from species tn species
【单选题】立式车床每次下降或上升()时,应先将横梁上升或下降20mm~30mm,这是为了消除间隙,以保持其位置精度。