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[主观题]
A bond is actually an IOU, a written contract which stipulates the par value the matur
ity date and the rate of interest paid by the issuing company to the bond holders quarterly, semi-annually or annually.()
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bid bond(tender bond、bid guarantee、bid seeurity)
performance guarantee(performance bond、performance security)
Two different bond lengths are observed in the PF5molecule,but only one bond length is observed in SF6. Explain the difference.
Arrange C—C, C==C and C≡C in order of(a)increasing bond energy (b)increasing bond length