A.PTFE
B.mixture of resin
C.glass fiber in woven form
D.glass fiber in mat form
walks of modern buildings.
A.can
B.may
C.should
D.must
A.for
B.from
C.in
D.over
A.on, for
B.at, for
C.in, to
D.on, to
A.铒玻璃激光(Er:Glass,1550nm)
B.掺钕钇铝石榴石激光(Nd:YAG,1320nm)
C.Nd:YAG,1440nm
D.Er:Fiber激光(1410nm)
E.铒激光(Er:YAG2940nm)
B、Seniors, superiors, and guests are served first.
C、To show respect and humility, keep your liquor glass lower than others’ when cheering.
D、The host usually makes the first toast.
A.liquid
B.vapor
C.water drop
D.drip