When drawing a flowchart, the condition judgment should be placed in ______（）
A. rounded rectangle
B. circle
C. rectangle
D. diamond
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The options that belong to the high-level programming language include ______（）
A. Python language
B. Assembly language
C. Machine language
D. C++ language
KIC is the index of fracture toughness of type I crack. The following statement is correct（）
A. when KⅠ ＜ KⅠC, crack began to expand, brittle fracture
B. when KⅠ ＞ KⅠC, crack extension occurs brittle fracture of instability
C. when KⅠ = KⅠC, extension began to occur
D. when KⅠ = 1/2KⅠC, crack extension
The following statement about fatigue is true（）
A. The stress of fatigue is higher than the yield strength of static load
B. Obvious plastic deformation can be observed at fatigue fracture
C. Fatigue fracture can be divided into fatigue source, bright area, rough area
D. The occurrence of fatigue fracture is premonitory and is called brittle fracture
What’s true about the fracture is that（）
A. Brittle material fracture fibrous
B. Ductile materials have no obvious plastic deformation before fracture
C. The fracture of the ductile material is crystalline and shiny
D. The fracture of brittle materials is crystalline or porcelain
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