The basic method to study the internal forces of components in material mechanics is（）
A. Superposition method
B. Method of section
C. Force method
D. Energy method
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The operation model of C2C e-commerce does not include__（）
A. Online auction
B. Third-party trading platform
Classified advertising
D. Online gift model
All of the following are types of firewall except（）
A. Packet Filtering Firewall
B. Proxy Firewall
C. Stateful Inspection Firewall
D. IDS Firewall
Promoting products and brands by Gmail belongs to__（）
A. online advertising marketing
B. mailing list marketing
C. IM marketing
D. Email marketing
Compared with plastic materials, the biggest characteristic of the tensile mechanical properties of brittle materials is（）
A. Low intensity
B. Small deformation under the same tension
C. There is almost no plastic deformation before fracture
D. The stress-strain relationship strictly follows Hooke’s law
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