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【单选题】
不属于胸膜壁层的结构是A.
肋胸膜
B.
膈胸膜
C.
纵隔胸膜
D.
肺胸膜
E.
胸膜顶
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举一反三
【单选题】Almost all cell phones sold in Canada are sold at subsidized prices, with expensive plans. Almost all cell phones sold in Europe are sold at full price with cheaper plans. A cell phone manufacturer kn...
A.
geographic
B.
economic
C.
demographic
D.
benefit
【单选题】Cell phones are now widely used, _______possible for us to talk to anyone from almost anywhere.
A.
make it
B.
to make it
C.
making
D.
making it
【简答题】New York State has passed the USA’s first state law banning motorists talking on hand-held cell phones. The ban will begin November 1, although drivers caught using hand-held cell phones will be given...
【简答题】Smoking was banned on almost all ______ in 198
【单选题】Driving while talking on a cell phone is almost as dangerous as driving after drinking.
A.
Y
B.
N
C.
NG
【多选题】In almost all adult tissues, cells are continually dying and being replaced; throughout this hurly-burly of cell replacement and tissue renewal, the organization of the tissue must be preserved due to...
A.
Cell communication: each type of specialized cell continually monitors its environment for signals from other cells and adjusts its behavior accordingly; the proliferation and even the survival of most vertebrate cells depends on such social signals. This communication ensures that new cells are produced and survive only when and where they are required.
B.
Selective cell adhesion: because different cell types have different cadherins and other cell adhesion molecules in their plasma membrane, they tend to stick selectively, by homophilic binding, to other cells of the same type. They may also form selective attachments to certain other cell types and to specific extracellular matrix components. The selectivity of these cell adhesions keeps cells in their proper positions.
C.
Cell memory: specialized patterns of gene expression, evoked by signals that acted during embryonic development, are afterward stably maintained, so that cells autonomously preserve their distinctive character and pass it on to their progeny. A fibroblast divides to produce more fibroblasts, an endothelial cell divides to produce more endothelial cells, and so on.
D.
all the above.
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