F1 SCIENCE

Part a:以下請填上岩定錯:
1.A stop watch can be used to measure time intervals.
2.Before we light a Bunsen burner,we open its air hole to obtain the blue flame directly.
Part b:complete following sentences.
1.the blue bunsen flame is non-luminous and its shape is__
2.a scientific theory is accepted if its __ are the same as the __ otherwise,it may be overthrown.